Zach Ertz caught the 1-yard touchdown pass in the second quarter at Lincoln Financial Field and spotted a celebrity fan in the back of the end zone. So Ertz strolled up to baseball megastar Mike Trout and handed the popular Eagles fan the football. Ertz, one of the league’s best tight ends, has souvenirs to spare. The scoring grab that came in a 33-10 victory over the 49ers last Sunday was his sixth touchdown of the season. The Broncos once again face an elite tight end on Sunday, and that poses a challenge for a defense that gave up seven catches, 133 yards and a touchdown to the Chiefs’ Travis Kelce on Monday night. They’ve also yielded big production to Jason Witten of the Cowboys, Evan Engram of the Giants and Hunter Henry of the Chargers. And they lost Buffalo tight end Charles Clay in the red zone in Week 3 for a damaging third-quarter touchdown in a 26-16 loss to the Bills. “Now we move on to Ertz, another great tight end, one of the top tight ends in the league,” Broncos safety Justin Simmons said. “It’s going to be another challenge to be able to identify him, make sure we’re able to limit his touches. He’s the top receiving target (Eagles quarterback Carson) Wentz has. It’s his security blanket. When all else fails, he can rely on Ertz to go get him a first down. It’s going to be another challenge for us in the back end that we not only contain him, but that we take him out of the game.” The Broncos (3-4), for the third consecutive season, have a championship-level defense. They have allowed a league-low 261 yards per game. But they’ve surrendered four touchdown passes and 76.1 yards per game to tight ends, which ranks 27th in the league, according to Football Outsiders.